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Inventories (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Line Items]    
Raw materials $ 5,990,124 $ 6,109,807
Work-in-process 1,947,084 777,056
Finished goods 2,010,753 1,396,609
Total $ 9,947,961 $ 8,283,472